Recent Topics
I need your help picking out fireworks for a show.
by joegreen - 05/30/20 12:13 AM
Best off the shelf oil for the price
by samiamz - 05/30/20 12:09 AM
I upgrade my car
by miden851 - 05/30/20 12:00 AM
Ford PVD Wheels Defects
by kstanf150 - 05/29/20 07:48 PM
General thoughts on high milage oils.
by tblt44 - 05/29/20 07:09 PM
Jeep Wrangler JL
by dishdude - 05/29/20 06:43 PM
Valvoline MaxLife 5W-20
by Jackson_Slugger - 05/29/20 06:33 PM
Yamaha dry sump PWC and oil level sensitivity.
by ledslinger - 05/29/20 06:30 PM
WSS-M2C946-B1 vs WSS-M2C961-A1
by W9HDG - 05/29/20 06:16 PM
Waterfall Eco Dynamic tires
by Saabist - 05/29/20 05:55 PM
O’reilly clearance
by Gonz - 05/29/20 04:56 PM
2016 Overland Jeep Wrangler Oil/Filter
by Since1941 - 05/29/20 04:24 PM
Next Pistol Opinions
by Gebo - 05/29/20 03:28 PM
Briggs and Stratton valve clearance
by supton - 05/29/20 02:38 PM
50 cal. shell
by Donald - 05/29/20 01:52 PM
Fleet Farm Rotella T6 Sale + Shell Rebate
by shibby6600 - 05/29/20 01:26 PM
QS Ultimate Durability 5W-30
by js1956 - 05/29/20 12:51 PM
KPVD Eerily Deserted
by wings&wheels - 05/29/20 12:24 PM
Newest Members
dieselworks, suburbandoom, alltogether, Vig03, dstocker
71566 Registered Users
Who's Online Now
42 registered members (carlprop, ArrestMeRedZ, Blkstanger, Arcoril, blufeb95, 928, 5 invisible), 1,344 guests, and 33 spiders.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums67
Topics306,032
Posts5,285,230
Members71,566
Most Online4,538
Jan 20th, 2020
Donate to BITOG
Print Thread
Hop To
Page 1 of 9 1 2 9
Mobil 15w50 in 0w20 engine. #4457199 07/12/17 12:08 PM
Joined: Jan 2016
Posts: 946
V
Vladiator Offline OP
OP Offline
V
Joined: Jan 2016
Posts: 946
My engine's oil cap recommendation states 0w20. I have been using Pennzoil 0w40 SRT for quite some time. Last oil change I switched to Mobil 1 15w50, just for S&G. I drive a lot and have a lot of idling time too. On average I go through 1 tank of gas per day. So if any changes take place - I notice them right away and can confirm if the change is permanent, or a one-time spike.

Here are the results of Mobil1 15w50 in 2009 Scion xB:

- Fuel economy did not take a hit over the past 7 tanks of gas, compared to the SRT 0w40. I was surprised, because I was under the impression that SRT 0w40 is a very "light" 40w and the 15w50 is a very "heavy" 50w. Expected an MPG drop, but that did not happen.

- Really enjoying the smoothness of throttle response in the lower RPM range. Feels like the engine gained some torque. Can't explain why... Better ring seal?... BUT hate the slight HP loss in the upper RPM range. Very minor, but the loss is there.

I will run this oil for 7k miles (my longest OCI yet in this vehicle) and will send it off for a UOA.


0W20 in summer at Death Valley is as good as 25w70 in winter at Alaska. Both can be done, neither is good for the engine long term. Oil grade is chosen by CLIMATE and OPERATING CONDITIONS.
Re: Mobil 15w50 in 0w20 engine. [Re: Vladiator] #4457207 07/12/17 12:17 PM
Joined: Apr 2017
Posts: 518
T
TheKracken Offline
Offline
T
Joined: Apr 2017
Posts: 518
What are you trying to do here? Or did you just find a really good price?


03 Lexus GX470 215k miles - PUP 5w-20
04 Toy Sienna awd: Pennzoil 0w20 295k Miles

2011 Prius 96k miles RLI 5w20 --- Wrecked frown
97 Toy T100 4x4: 242k Miles - currently given to my mother.

Re: Mobil 15w50 in 0w20 engine. [Re: Vladiator] #4457212 07/12/17 12:24 PM
Joined: Apr 2017
Posts: 1,736
M
mightymousetech Offline
Offline
M
Joined: Apr 2017
Posts: 1,736
Back when I first started to drive, put 20W50 in my Civic (that called for 5W30) cause I drove the [censored] out of it, and someone said I should. Six months later spun a couple rod bearings.

Last edited by mightymousetech; 07/12/17 12:25 PM.

Mighty Mouse Tech
BMW Diagnostic and Alignment Tech
2013 BMW 135i M Sport Edition PPE 5W40 MTL/MT-LV
2010 BMW 328i X-Drive, PPE 5W40 MT-LV
Re: Mobil 15w50 in 0w20 engine. [Re: Vladiator] #4457214 07/12/17 12:30 PM
Joined: Mar 2008
Posts: 6,645
B
bubbatime Offline
Offline
B
Joined: Mar 2008
Posts: 6,645
Dont stop now!! SAE 60 and SAE70 are just right around the corner!!

Re: Mobil 15w50 in 0w20 engine. [Re: mightymousetech] #4457215 07/12/17 12:30 PM
Joined: May 2008
Posts: 6,318
L
lexus114 Offline
Offline
L
Joined: May 2008
Posts: 6,318
Originally Posted By: mightymousetech
Back when I first started to drive, put 20W50 in my Civic (that called for 5W30) cause I drove the [censored] out of it, and someone said I should. Six months later spun a couple rod bearings.


that might have happened anyway regardless of what weight oil was in there. the other reason could have been cold flow into the greatly needed areas when cold?


2020 Nissan Kicks SR
Re: Mobil 15w50 in 0w20 engine. [Re: Vladiator] #4457227 07/12/17 12:41 PM
Joined: Dec 2006
Posts: 21,554
A
aquariuscsm Offline
Offline
A
Joined: Dec 2006
Posts: 21,554
I'm a thick oil guy,but I think thin oils have their place,in 4cyl engines. The thickest I'd go is 5W30.


1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Pennzoil Platinum High Mileage 10W30

Re: Mobil 15w50 in 0w20 engine. [Re: Vladiator] #4457234 07/12/17 12:50 PM
Joined: Jun 2003
Posts: 3,066
U
userfriendly Offline
Offline
U
Joined: Jun 2003
Posts: 3,066
Thin oil in small engines and thick oil in big engines aquariuscsm? Sounds just like tired trucker... "10w30 in a 13 liter jerking 80,000 pounds on 10w30", implying that a Duramax should only need 0W16.

Last edited by userfriendly; 07/12/17 12:50 PM.
Re: Mobil 15w50 in 0w20 engine. [Re: Vladiator] #4457237 07/12/17 12:52 PM
Joined: Oct 2015
Posts: 3,483
F
FordCapriDriver Offline
Offline
F
Joined: Oct 2015
Posts: 3,483
I run 20W-50 in an engine spec'd for 10W-40 with no issues, and it's a small 1124cc gas engine and i have not noticed any drop in fuel economy either.


1975 Ford Capri II Ghia 3000 V6 - 315k, Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - 110k, Valvoline Maxlife 10W-40

Re: Mobil 15w50 in 0w20 engine. [Re: Vladiator] #4457242 07/12/17 12:58 PM
Joined: Jan 2009
Posts: 14,689
T
tig1 Offline
Offline
T
Joined: Jan 2009
Posts: 14,689
In 1978 I put M1 5-20 in my Chevy engine calling for 10-40 when I lived in Maine. In cold temps(-5 to -20F) the lifters clattered awful on cold start with the 10-40. After the switch my engine ran smoother and all of the lifter clatter stopped, a little MPG was noticed, and I was able to increase my OCI to 10K without an issue.


2007 Ford Fusion 258,000 miles
M1 5-20HM
2017 Ford Fusion 91K
M1 0-20EP
10,000 mile OCIs on both engines
M1 ATF and M1 LV HP ATF
M1 10-30 in all OPE
MC filters

Re: Mobil 15w50 in 0w20 engine. [Re: aquariuscsm] #4457251 07/12/17 01:04 PM
Joined: Jan 2016
Posts: 946
V
Vladiator Offline OP
OP Offline
V
Joined: Jan 2016
Posts: 946
Originally Posted By: TheKracken
What are you trying to do here? Or did you just find a really good price?

I had a few quarts laying around from last year's Autozone clearance sale. My OPE have a lot of QuickSilver 25w40 stashed for it, so I decided to use the 15w50 in the DD.

Originally Posted By: mightymousetech
Back when I first started to drive, put 20W50 in my Civic (that called for 5W30) cause I drove the [censored] out of it, and someone said I should. Six months later spun a couple rod bearings.

What time of the year was it? It's gonna be above 70°F here for a while, will hit triple digits soon. So no cold starts to worry about. And the hot temps and frequent idling should keep the viscosity on the lower end.

Originally Posted By: bubbatime
Dont stop now!! SAE 60 and SAE70 are just right around the corner!!
If I get Castrol 10w60 for free or less than $2/qt - I'll dump it in without thinking twice about it. But that's about as viscous as I'll ever go...

Originally Posted By: aquariuscsm
I'm a thick oil guy,but I think thin oils have their place,in 4cyl engines. The thickest I'd go is 5W30.
I see what you mean, but at the same time most of Europe (slightly colder climate for the most part) runs on 10w40-20w50 in sub-2L engines until the cars rust out. And most, if not all, Mitsubishi Evo 4-cylinders run on 20w50. According to Evo forums that is... Yes, my engine is nothing like an Evo, but still fits in the 4-cyl topic.


0W20 in summer at Death Valley is as good as 25w70 in winter at Alaska. Both can be done, neither is good for the engine long term. Oil grade is chosen by CLIMATE and OPERATING CONDITIONS.
Re: Mobil 15w50 in 0w20 engine. [Re: Vladiator] #4457255 07/12/17 01:05 PM
Joined: Sep 2014
Posts: 2,306
D
Dyusik Offline
Offline
D
Joined: Sep 2014
Posts: 2,306
I run 15w40, as thick as 10w50 before in a 1.0L 4 cylinder that revs up to 15.5k rpm, I'm sure my engine tighter than a plane Jane 4 banger designed to putt to the grocery store...


95 Cherokee 190K DELO XLE 10W30, XG8
04 YZF-R1 21K RT6 15w40, XG7317
18 RAM 3500 15k Delvac 15w40, DBL7349
96 Cherokee
Re: Mobil 15w50 in 0w20 engine. [Re: Vladiator] #4457256 07/12/17 01:06 PM
Joined: Sep 2004
Posts: 8,753
A
andyd Offline
Offline
A
Joined: Sep 2004
Posts: 8,753
I would use 20w 50 in any car with a carburettor. 20w50 gives safety margins over a thinner oil. When a leaky radiator led to a hole detonating a hole in #4 piston, the rod bearing and journal were pristine. I attribute this to the 20w50 Castrol I was using in the Datsun 1.6 . I dropped to 10w 30 for winter.


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: Mobil 15w50 in 0w20 engine. [Re: FordCapriDriver] #4457258 07/12/17 01:07 PM
Joined: May 2014
Posts: 1,807
P
philipp10 Offline
Offline
P
Joined: May 2014
Posts: 1,807
Originally Posted By: FordCapriDriver
I run 20W-50 in an engine spec'd for 10W-40 with no issues, and it's a small 1124cc gas engine and i have not noticed any drop in fuel economy either.


Guys...if there was a decrease in fuel economy it would be in the sub 1% range. I doubt your highly calibrated instruments (gas pump) would be accurate enough to notice...

Re: Mobil 15w50 in 0w20 engine. [Re: philipp10] #4457265 07/12/17 01:14 PM
Joined: Jan 2016
Posts: 946
V
Vladiator Offline OP
OP Offline
V
Joined: Jan 2016
Posts: 946
Originally Posted By: philipp10

Guys...if there was a decrease in fuel economy it would be in the sub 1% range. I doubt your highly calibrated instruments (gas pump) would be accurate enough to notice...

I once tried Valvoline 5w40 MST in my previous vehicle with 1zz-Fe engine. It felt like I was pulling a 5000 lbs trailer and my MPG decreased by 30-35% until next oil change. Needless to say it was a shorter OCI due to listed factors.


0W20 in summer at Death Valley is as good as 25w70 in winter at Alaska. Both can be done, neither is good for the engine long term. Oil grade is chosen by CLIMATE and OPERATING CONDITIONS.
Re: Mobil 15w50 in 0w20 engine. [Re: Vladiator] #4457318 07/12/17 02:21 PM
Joined: Dec 2006
Posts: 21,554
A
aquariuscsm Offline
Offline
A
Joined: Dec 2006
Posts: 21,554
My reasoning,my gf had an old high mileage (200k+) Probe that used oil like it was going out of style. I tried 20W50 in it once and it made that slow car even slower haha. On the other side,my friend used 20W50 in his old 350 V8 Nova and you couldn't tell any difference.


1996 Nissan 300ZX 5-speed,Arctic Pearl(#175 of 300)
Quaker State Ultimate Durability 10W30
2012 Honda Accord Coupe EX-L 2.4,auto,San Marino Red
Pennzoil Platinum High Mileage 10W30

Page 1 of 9 1 2 9
Previous Thread
Index
Next Thread

BOB IS THE OIL GUY® Powered by UBB.threads™